Question

When a magnet is brought close to a wire-loop, the magnetic field around the loop ____

• A. changes.
• B. remains constant.
• C. goes to infinite.
• D. becomes zero.

Answer 1

The correct option is A

changes.

When a magnet is brought close to a wire-loop, the magnetic field around the loop increases.

When we bring the north pole of a bar magnet toward the loop, it would start to behave as north pole so as to repel the magnet. That is, the direction of current induced in the loop is such that it opposes the cause producing it.